Mitsui Chemicals to buy JSR from state fund in Japan's largest chemicals deal

Overview

Updated 2 hours ago

Japan's state-backed fund bought JSR in 2024 and said it would use the photoresist maker to drive consolidation in semiconductor materials. On Nov. 9 it sold JSR to Mitsui Chemicals for ¥1.84 trillion ($11.61 billion), the largest acquisition in the history of Japan's chemicals industry.

Mitsui will pay with a ¥1.64 trillion bridge loan from its main banks and a ¥200 billion preferred-share investment from the Development Bank of Japan. Its shares fell 8.5% the same day. Closing is targeted for the second half of the fiscal year ending March 2028, pending antitrust and foreign investment reviews.

Why it matters

Mitsui is taking on ¥1.64 trillion in debt to become Japan's largest chip-materials supplier, tying a critical supply link to one leveraged balance sheet.

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Key Indicators

$11.6B

Headline deal value

Mitsui and DBJ's purchase price for JSR, at an assumed exchange rate.

-8.5%

Mitsui Chemicals share move

One-day drop on the Tokyo exchange after the announcement.

¥1.64T

Bridge loan

Short-term bank borrowing Mitsui will refinance within a year of closing.

¥200B

Development Bank of Japan investment

Preferred shares, entirely non-voting, held alongside Mitsui.

¥40B

Targeted annual profit gain

Additional yearly profit Mitsui aims to reach by fiscal 2035.

Voices

Curated perspectives — historical figures and your fellow readers.

People Involved

Satoshi Ichimura

President and CEO, Mitsui Chemicals

Leading the JSR acquisition and the refinancing that follows it

Shogo Ikeuchi

President and CEO, JIC Capital

Sold JSR two years after the state fund bought it

Tetsuro Hori

President and CEO, JSR Corporation

JSR to become a consolidated subsidiary of Mitsui Chemicals

Organizations Involved

Mitsui Chemicals

Chemical manufacturer

Buyer; will consolidate JSR

Tokyo chemical maker that supplies pellicles and back-end chip materials; buying JSR to build a semiconductor materials platform.

JSR Corporation

Semiconductor materials maker

Being sold by JIC to Mitsui Chemicals

Tokyo maker of photoresists and other chip materials, owned by a state fund since 2024.

Japan Investment Corporation

State-backed investment fund

Seller

Government fund that bought JSR in 2024 and is now selling it to a strategic buyer.

Development Bank of Japan

Government-affiliated lender

Co-investor

Policy lender putting ¥200 billion into the deal through non-voting preferred shares.

Timeline

2024 November 2026

5 events Latest: Today

Tap a bar to jump to that date

November 2026
Mitsui agrees to buy JSR for ¥1.84 trillion
Today Deal

Mitsui signs a share purchase agreement with JIC funds, with DBJ investing ¥200 billion; Mitsui shares close down 8.5%.
Today
Financing plan sets ¥1.64 trillion bridge loan
Today Financing

Mitsui discloses a ¥1.64 trillion bridge loan and up to ¥150 billion in new shares, targeting A-category credit metrics within a year of closing.
Today
Reuters names Mitsui as final buyer
Report

Mitsui Chemicals shares begin sliding before the formal announcement as Reuters identifies it as the winning bidder.
November 2026
May 2026
Reuters reports JIC is weighing a JSR sale
Report

Reuters first reports that the state fund is considering selling JSR, opening a process that draws seven or eight prospective buyers.
May 2026
2024
Japan's state fund takes JSR private
Ownership

Japan Investment Corporation buys JSR for ¥900 billion, saying it will use the company to drive consolidation in semiconductor materials.
2024

Scenarios

Deal clears regulators and closes as planned in late 2027

Likely Resolves by Q1 2028

Discussed by: Mitsui Chemicals' own disclosure, which targets closing in the second half of the fiscal year ending March 2028

Mitsui's filing says the transaction needs competition-law and foreign-investment clearances in Japan and abroad, and that the timing of those procedures is hard to predict. If reviews run without conditions that change the deal's economics, JSR becomes a Mitsui subsidiary and the ¥40 billion profit target by fiscal 2035 comes into view.

Regulators require divestitures before clearance

Possible Resolves by Q1 2028

Discussed by: Antitrust lawyers and trade press covering Japanese chip-materials consolidation

Mitsui's pellicles and back-end tapes overlap with JSR's resists in the same customer base, and both companies sell into the same fabrication plants. A competition authority could require a disposal or behavioral commitments before allowing the combination. That would delay closing past the target and trim the synergies Mitsui has promised.

Debt load forces a bigger equity raise or deeper asset sales

Possible Resolves by Q1 2028

Discussed by: Investors who sold Mitsui shares on the announcement, and analysts quoted by Investing.com

The financing plan is where investor concern centered. Mitsui says net debt to earnings will briefly exceed four times and that it will cap common-share issuance at ¥150 billion, using mezzanine debt treated as equity by rating agencies to fill the gap. If rating agencies or lenders demand more, Mitsui could sell more of JSR than planned, including businesses it currently intends to keep.

Historical Context

3 moments from history that rhyme with this story — and how they unfolded.

December 2019 - 2020

Showa Denko buys Hitachi Chemical (2019-2020)

Showa Denko agreed to buy Hitachi's chemical unit, then Japan's largest chemicals acquisition. The buyer took on substantial debt to fund the purchase and folded the two businesses together through a holding company structure.

Then

The combined group carried heavy borrowings into a weaker chemicals market.

Now

The company renamed itself Resonac Holdings in 2023, and the deal became the reference point for how debt-funded Japanese chemical mergers play out.

Why this matters now

It is the deal Mitsui's purchase now exceeds in size, and the closest recent test of whether a leveraged Japanese chemical merger produces the promised synergies.

1999 - 2013

Elpida Memory and Japan's chip consolidation (1999-2013)

NEC and Hitachi merged their memory chip businesses into Elpida Memory, later joined by Mitsubishi Electric's memory operations, with government backing. The company became Japan's last major dynamic random-access memory maker.

Then

Elpida filed for bankruptcy protection in February 2012 after years of losses and falling memory prices.

Now

Micron bought its assets in 2013, and Japan exited mainstream memory manufacturing.

Why this matters now

A precedent for state-orchestrated consolidation in chips, and a reminder that combining Japanese chip assets does not by itself fix competitiveness.

2024

JIC takes JSR private (2024)

Japan Investment Corporation bought JSR for ¥900 billion, taking a listed chip-materials maker off the Tokyo exchange. The fund said it would use the company to drive consolidation in semiconductor materials.

Then

JSR operated as a privately held supplier with a state fund as its owner.

Now

The fund instead sold to a domestic chemical major, taking advantage of higher chip-sector valuations during the AI boom.

Why this matters now

The sale completes a two-year round trip for JSR: public company, state asset, then subsidiary of a larger chemical maker.